title: Recurrent tibial intra-cortical osteosarcoma: a case report and review of the literature.
abstract: BACKGROUND
  Intra-cortical osteosarcoma is the rarest subtype of osseous-producing tumor. Most reported cases present a low-grade histology with slow progression and good oncological control after adequate treatment. In this report, we describe a case and review the literature to propose adequate treatment.
  
  
  METHODS
  We present the case of a 21-year-old Thai woman who was thought to have an intra-cortical osteosarcoma of the right tibia. We performed a wide resection and reconstruction with bone transportation using an Ilizarov external fixator. The tumor recurred five years later at the same site with a similar histology. We performed a new resection and reconstruction by ankle arthrodesis with adjuvant chemotherapy. At the last follow-up, she had remained active and free from disease for seven years.
  
  
  CONCLUSIONS
  This case report of recurrent intra-cortical osteosarcoma describes an atypical presentation. The low-grade histology, adequate surgical margin and adjuvant chemotherapy of the recurrent lesion were favorable factors, and our patient has remained free of any tumor recurrence.
authors.affiliation: Musculoskeletal Oncology Division, Department of Orthopedics, Faculty of Medicine, Chiang Mai University, Suthep Road, Chiang Mai TH-50200, Thailand. dumnoensun@hotmail.com.
authors.forename: Olarn
authors.initials: O
authors.lastname: Arpornchayanon
authors.forename: Taninnit
authors.initials: T
authors.lastname: Leerapun
authors.forename: Chate
authors.initials: C
authors.lastname: Sivasomboon
authors.forename: Jongkolnee
authors.initials: J
authors.lastname: Settakorn
authors.forename: Nantawit
authors.initials: N
authors.lastname: Sugandhavesa
authors.forename: Dumnoensun
authors.initials: D
authors.lastname: Pruksakorn